Control logic power down circuit
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United States of America Patent
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May 30, 1995
Grant Date -
N/A
app pub date -
Mar 25, 1994
filing date -
Mar 25, 1994
priority date (Note) -
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Abstract
A secondary low voltage regulator for systems having low voltage control logic and high voltage devices susceptible to thermal damage due to loss of control logic power. When a power failure interrupts the primary power supply for the control logic, the secondary regulator uses the falling high voltage normally supplied to the high voltage devices as an input to a secondary regulator which supplies power to the control logic. The control logic remains active until the falling high voltage reaches a low level where the high voltage devices will not be heat damaged if not controlled by the control logic circuitry.
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